机器学习- 吴恩达Andrew Ng 编程作业技巧 for Week5 Neural Networks Learning
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ML:Neural Networks: Learning
https://www.coursera.org/learn/machine-learning/resources/EcbzQ
FAQ for Week 5 and programming exercise 4
https://www.coursera.org/learn/machine-learning/discussions/weeks/5/threads/ag_zHUGDEeaXnBKVQldqyw
Unit Test
All Unit Test
https://www.coursera.org/learn/machine-learning/discussions/all/threads/0SxufTSrEeWPACIACw4G5w
Ex4 Test Cases
Programming Exercise Test Cases (list) - 详细函数讲解
https://www.coursera.org/learn/machine-learning/discussions/all/threads/m0ZdvjSrEeWddiIAC9pDDA
求 nnCostFunction的cost function，要理解下面两篇文章：
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ex4 Tutorial for forward propagation and cost
https://www.coursera.org/learn/machine-learning/programming/AiHgN/neural-network-learning/discussions/threads/QFnrpQckEeWv5yIAC00Eog -
Computing the NN cost J using the matrix product
https://www.coursera.org/learn/machine-learning/discussions/all/threads/AzIrrO7wEeaV3gonaJwAFA
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